Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.6177l&link_type=abstract
HST Proposal ID #6177
Astronomy and Astrophysics
Astronomy
Hst Proposal Id #6177
Scientific paper
The problem of calibrating the FGSs for astrometric work involves two complementary aspects: the plate scale and the optical distortions. The scale-length desired in these calibration efforts differs. The essential point of this calibration is to refine our knowledge of the plate scale in the central region of the astrometer FGS for this is where all annual parallax work will be executed by the GOs and GTOs. It rests on a set of stars included in the ESA Astrometry satellite HIPPARCOS's observing list.
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